Tube-in-tube (Double-Pipe) Heat Exchanger, also known as a Hairpin Heat Exchanger, is a simple yet efficient heat transfer device consisting of one pipe concentrically mounted inside another. The inner pipe carries one fluid, while the annular space between the pipes carries the other fluid, enabling heat exchange through the inner pipe wall. This design is ideal for applications requiring high pressures, high temperatures, or handling of fouling fluids where simplicity, reliability, and ease of maintenance are critical.
Enhanced Surface Designs: Low-finned inner tubes to increase heat transfer area
Counter-Flow Optimization: True counter-current flow for maximum temperature approach
Modular Construction: Standardized components for easy expansion or reconfiguration
Thermal Stress Management: Expansion joints and flexible designs to handle differential expansion
Temperature Resistance
Fouling Resistance: Easy mechanical cleaning and inspection
Compact Design: Modular arrangement saves space
Material Versatility: stainless steel 304/316L
Low Maintenance: Simple design with minimal components
Leak Containment: Double containment design for hazardous fluids
Energy Efficient: True counter-flow for optimal heat recovery
Oil & Gas: Wellhead cooling, gas compression cooling, amine heat exchange
Chemical Processing: High-pressure reactor feed/effluent exchange
Power Generation: Lube oil cooling, seal oil systems
HVAC: Heat recovery systems, district heating
Industrial Machinery: Hydraulic oil cooling, compressor cooling
Pharmaceutical: High-purity fluid heating/cooling
Proven Reliability: Simple design with decades of proven performance
Extreme Condition Capability: Handles pressures and temperatures beyond most exchangers
Maintenance Friendly: Easy inspection and cleaning without special tools
Customizable: materials and wide range of configurations available
Cost Effective: Lower initial cost for high-pressure/small duty applications
The double-pipe exchanger comprises inner pipes (typically seamless) and outer pipes (shells) assembled in a modular hairpin configuration. With multiple hairpins connected in series or parallel to meet duty requirements. Designs include bare pipe, finned tube (for enhanced heat transfer), and multi-tube variants (multiple inner tubes within one shell). Connections are flanged or welded for integrity under extreme conditions.
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